Table 6.50 — DRM_Continuous_Level_Of_Detail_Related_Geometry
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Property |
Description |
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Class |
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Superclass |
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Subclass |
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Definition |
An instance of this DRM class is used to represent continuous terrain or continuous adaptive terrain, by replacing a <DRM Polygon> with a set of fragmented <DRM Polygon> instances that represent the terrain at a finer level of detail at close range (or alternatively, with a coarser level of detail at long range). The general idea is that basic <DRM Polygon> instances have fragmented <DRM Polygon> instances within them, and those <DRM Polygon> instances may have subsequent fragmentation. |
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Class diagram |
Figure 6.56 — DRM_Continuous_Level_Of_Detail_Related_Geometry |
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Inherited field elements |
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Field elements |
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Associated to (one-way) (inherited) |
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Associated to (one-way) |
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Associated by (one-way) (inherited) |
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Associated by (one-way) |
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Associated with (two-way) (inherited) |
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Associated with (two-way) |
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Composed of (two-way) (inherited) |
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Composed of (two-way) |
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Composed of (two-way metadata) (inherited) |
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Composed of (two-way metadata) |
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Component of (two-way) (inherited) |
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Component of (two-way) |
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Constraints |
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Clarifications |
1 If this value is TRUE, each “descendant” of this aggregation - that is, each <DRM Geometry> instance that exists in the component tree rooted at the given <DRM Aggregate Geometry> - shall be unique, in the sense that it shall appear in only one “branch” of this aggregation. If unique_descendants is FALSE, at least one <DRM Geometry> instance appears in more than one “branch” of the aggregation. 2 If this value is TRUE, each “branch” of this aggregation strictly complies with the organizing principle for its particular subclass. If this value is FALSE, at least one “branch” does not strictly comply with the given organizing principle. See the organizing principle constraint for each specific subclass for details. 3 This flag specifies whether the current level of fragmentation is the lowest level of fragmentation for a specific chain. This flag is set to SE_TRUE if no other <DRM Continuous Level Of Detail Related Geometry> instances are found below this chain's current level. 4 An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature> instance indicates that the <DRM Geometry Hierarchy> and the <DRM Feature> are alternate representations of the same environmental object. 5 An association between two <DRM Geometry Hierarchy> instances indicates that they are alternate representations of the same environmental object. 6 An association from a <DRM Hierarchy Summary Item> instance to a <DRM Geometry Hierarchy> indicates that the <DRM Hierarchy Summary Item> summarizes that <DRM Geometry Hierarchy>. 7 An association from a <DRM Reference Surface> instance to a <DRM Geometry Hierarchy> indicates that the <DRM Geometry Hierarchy> organizes the geometric objects that specify the resolution surface of the <DRM Reference Surface>. 8 In the case where multiple <DRM Collision Volume> components are specified for a given <DRM Aggregate Geometry>, the union of the volumes thus specified is used in collision detection. |
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Example(s) |
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